Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915314l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #153.14
Astronomy and Astrophysics
Astronomy
Scientific paper
We calculate light curve absorption dips produced by accretion stream impact on the disc in an X-ray binary. The dips are produced whenever the impact region on the disc blocks the observers line-of-sight (LOS) to the neutron star. The particular X-ray binary we consider is Her X-1, which has a large inclination so that the observers LOS passes near the disk surface and can readily be blocked by a small impact region. We compare calculated dip times to observed dip timings (Leahy and Igna 2011, ApJ,736, 73 and Igna and Leahy, 2011, MNRAS in press) and find that in order to produce a wide enough range of orbital phase and 35-day occurence of dips, we need to allow disc penetration by the stream, so that the stream can proceed to a second impact with the disc. With this extra feature we can reproduce the observed dips timings.
Igna Ciprian D.
Leahy Denis A.
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